Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7efc6032fe06c05…

MALICIOUS

PDF

77.8 KB Created: 2021-09-10 11:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1aec379052190699c7f517b844aec0c SHA-1: 23b09646d03ca715481a3c524df9437627542b11 SHA-256: e7efc6032fe06c0506847ae41fb30c6455d13675ce8d98bcec3bc688f5dd5981
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to link farms on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to phishing sites or download further payloads. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to obscure the true destination through a large number of links on varied domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://adamant54.ru/userfiles/files/raduwasujagujig.pdf In PDF document text
    • http://abwingstop.com/uploads/files/temudaxoliwe.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/lalolalesikerim.pdfIn PDF document text
    • http://kunbot.com/upload/files/15581549598.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/20203761598.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/zosorijamogivuwimiroxuv.pdfIn PDF document text
    • https://majubesar.com/contents/files/60876675608.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/xinal.pdfIn PDF document text
    • http://18554080.com/userfiles/file/posabikitosevuvusife.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/rasamopodizevebinuvovas.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/vedogakulabosonelede.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/89687447672.pdfIn PDF document text
    • https://izr.fr/files/lewinamamubaxemut.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/15305027648.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/99461308978.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/24148923374.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/75471676984.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/84485796749.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/b188d36dadf5b1031709d3729c274cfc/wuladajo.pdfIn PDF document text
    • http://smogy.ru/files/files/depakejumasilewopuv.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/36335088631.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/62763010443.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/10225791756.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/79810389079.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/bifuvotekasidukubudar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=money+cheat+pc+gta+5PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE616 10488 bytes
SHA-256: 6782ffa3ea415ae138bb180276ee777bdc5694d48ea9470c0ecd0c3fba0f6dcb
font_02_sfnt_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 16948 bytes
SHA-256: 295fca6aee7fe7df168145a84230f111a3bc134a6b54f8267ac1e46de2ee7e89